Camera shutter sound ?

You have to silent the phone itself. In the dropdown menu hit the bell symbol. It mutes the whole phone camera sound too.
It'd be nice if it was an option within camera.
can't you delete it thru the music app. it is listed there under songs.

You can go to the market and download "Audio Manager"
once you have that, go to "SYSTEM VOLUME" take it to "0"

Should work...worked on mine with D1-MIUI-0.11.26
Good Luck!!